Old world climbing fern is very similar to the Japanese climbing fern in its habit and highly invasive nature. The leaves are slightly different in shape, having a smooth rather than lobed edge and is found often in cypress swamps. Both species form a fire ladder allowing forest fire to reach the more vulnerable branches above. It is distinguishable by its winding tangled rachis (stem).
Eradication: Control of this fern is similar to the Japanese fern. Prescribed burning can help, but does not eliminate it altogether. Early discovery and eradication are crucial.